120997729 has 4 divisors (see below), whose sum is σ = 121033876. Its totient is φ = 120961584.

The previous prime is 120997699. The next prime is 120997741. The reversal of 120997729 is 927799021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 927799021 = 17 ⋅54576413.

It can be written as a sum of positive squares in 2 ways, for example, as 91240704 + 29757025 = 9552^2 + 5455^2 .

It is a cyclic number.

It is not a de Polignac number, because 120997729 - 2²¹ = 118900577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120997769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12474 + ... + 19939.

It is an arithmetic number, because the mean of its divisors is an integer number (30258469).

Almost surely, 2^120997729 is an apocalyptic number.

It is an amenable number.

120997729 is a deficient number, since it is larger than the sum of its proper divisors (36147).

120997729 is an equidigital number, since it uses as much as digits as its factorization.

120997729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36146.

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 120997729 is about 10999.8967722429. The cubic root of 120997729 is about 494.6056499351.

The spelling of 120997729 in words is "one hundred twenty million, nine hundred ninety-seven thousand, seven hundred twenty-nine".